Trigger mechanism.



c. 11. A. I'. L. Ross. TRIGGEB 'MBOHANIHH.` APPLICATION FILED MAB. 6; 191.0.

975,286. u Patented Nov. 8, 191.0. 2 SHEETS-SHEET 1.` 3.9.1.

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I c. H. A. P. L. Ross. TBIGGER MBGHANISM.; I APPLIUAT'ION FILED MAB. 5, i910. I 975,286, Patented NGV. 8, 1910.

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UNITED 'sTATEs PATENT onni'cn.

CHARLES H. A. F. I4. ROSS, OF BALNAGOWN CASTLE,v SCOTLAND.

emicrania 'MECHANIgM Specification of Letters Patent.

Application led` March 5, 1910. SerialNo. 547,445.

To all whom 'it may concern: y

Be it known that I, CHARLES H. A. F. L. Ross, a subject of His Majesty the King of Great Britain, residing at Balnagown Castle, Ross-shire, Scotland, have invented cerf tain new and useful Improvements in Trigger `Mechanisms; and I dol hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it ap pertains to make and use the same.

This invention relates to trigger mechanisms for automatic fire arms and has for its object to produce a device of this nature which will be simple in construction certain in action, will provide a long pull for the .trigger and one which willalso providea safety device which will render it impossible to fire the piece except when the breech bolt and barrel are interlocked.

With these and other objects in view, the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the claims.

Referring tothe accompanying drawings forming a part of this specication in which like numerals refer to like parts in all the views: .Figure 1,'is a sectional view of the breech portion'of a fire arm, showing the parts cocked .and ready for ring; Fig. 2, is a like view showing the position of the parts after the trigger has been pulled and the r- .ing pin'has gone forward,but before the bar: rel has moved; Fig. 3, isa sectional view', partly in elevation, ofthe part-s shown in Fig. 2 after the barrel has gone forward and the breech bolt and rin pin have been blown to the rear to re-coc the piece; and, Figs. 4 and 5,v are detail perspective views of y theindividual parts of the mechanism.

10 represents a .casing provided with a slot 11, the breech bolt 4. is provided wit-h a downwardly projecting piece 12 which slides 1n the s lot 11, and across the lower end of the piece 12 is a `yo`ke 13 which is guided 1n the slot 14 with which the frame 15 is provided. i

16 represents a spring which returns the breech block 9 and bolt 4 carried thereby, after it has been moved to the rear upon firing the piece. The breech block 9 is provided with any suitable mechanism, not

shown, for rotating it on its axis as it moves.

longitudinally of the piece to engage and disengage the barrel. j

rI he above 'parts do not in themselves form an integral portion of the present invention,

and, therefore, are not further illustrated.

The breech block 9 is furtherprovided `with a safety slot 20 with which the point .21 of the lever 22 is adapted to engage when the said block and barrel are properly interloclred and ready for firing, as best illus-A trated in Fig. 2.

25 represents a spring for projecting forward the firing pin 5 and 26 represents a casing for said spring extending slightly to the rear of the casing 10. The .firing pin '5 may be enlarged as 1t enters the casing V26 and carries the lug or projection 27 withl which the sear 28 of the lever'22 engages. The lever 22 is provided with a slot 30 and pivotally slides on the pin 31, as will-be more fully explained hereinafter. f

A tube 32 is pivoted as at 33 to thejexte sion of the lever 22 and the rod '36 telescoping in said tube is pivotedas at 34 to the trigger,.which in turn is pivoted as at 35'to the frame 15 ofthe piece. A spring 38 surrounds the tube 32 the rod 36 and serves to yieldingly normally force the sear 28 upwardlywhen the trigger Sis in its forward position, as shown in Fig. 1.

Pivoted as at 40 and slightly forward of `the`pin 3l is the dog 41 provided with the shoulder 42 against which the spring 43 takes at one end. The other end of said spring 43 takes against a shoulder 44 of the lever 22, and therefore, said spring 43 tends normally to force the lower end of said dog 41 forward, as will be readily understood.

4The lower end of this dog is provided with a projection 45 a notch 46 and an inclined lPatented Nov. ve, 191e.

surface 47 and preferably with a roller 48.

The trigger is provided with a projection 49 adaptedto engage the roller, as indicated in Fig. 1, to slide along the incline surface 47 until it reaches the notch46 as indicatedl in Fig. 2, and then upon further pressure'to further force the dog 41 upwardly and cause thesear 28 to be tripped or disengaged from the lug 27, as will be clear from the drawings.

The springv controlling the firing pin normally presses the lug 27 forward, and, therefore, normally presses forward the entire lever 22 so that the pin 31 normally occupies the rear end oft the slot 30, as indicated in Figs. 1 and 2. On the other hand the-spring 38 has a tendency to force the lever 22 bodily to the rear, and, therefore, to cause the said pin 31 to occupy the forward portion of the slot 30, as indicated in Fig. 3.

The operation of the invention is as foll lows z-Supposing the parts to be in the posai projection 49 reaches the notch 46, so that 2, which causes the-same to Ithe ug 27 the firing pin goes sition for firing illustrated in Fig. 1 and the trigger to be pulled, the projection 49 ofA the trigger will move over the roller 48 onthe dog 41 and along the Ainclined surface 47funtil it reaches the notch 46, thus giving an easy and long pull to the trigger which isnow' essential in all military re arms. This pull of the trigger is further cushioned by the spring 38 which will be compressed `during the movement just described and which will .tend to force the Sear 28 againstthe lug 27, as above stated.v The pressure fof the projection 49, however, on the dog 41 will slightly revolve the scar 28 aroundits (pivot 31 and will almost disengage the sear from the said lug by the time the a slight additional pull will fire the piece. In other words, the trigger may be pulled rapidly until the notch 46 is reached and thenupon reaching said notch the trigger fingerl will" feel the engagement of the projection 49 with said notch and a very slight additional pull may then be exerted tore the piece, thereby enabling the marksman to movement. ofthev lever, as Well as its rear.

ward-movement forces the lower endof the dog 41 to the rearvand past the projection lvents the piece 49-on the trigger and into the position' shown in Fig. 3, so that the pin 31 engagesthe forward end of the slot 30. In this position of the parts although the piece is cocked -owing to the lug 27 having been blown back behind the Sear 28, yet it is impossible to fire the piecefor the operating portion of the projection 49 is out of engagement with the dog 41. Upon Athe trigger being re leased, however, and permitted to again occupy the position shown in Fig. 1, the spring 43 forces the Idog 41 forwzvlrd and4 rengages the parts, as shown in Sad Fig. 1. But should the trigger now be pulled the piece still could notbe fired unless the parts are properly interlocked, and for the reason that the safety notch 20 in the breech block 94wou1d not permit the point 21 of the lever 22 to enter the same, as will be explained. As the breech block 9 came to the rear it not only moved longitudinally of the barrel but italso rotated upon its axis in order to disengage its threadsfrom the threads of the barrel, and, therefore, if the said block and barrel are not properly interlocked the said slot 20 would be angularly displaced so that thel point 2l could. not enter the same. The parts are so proportioned that unless the point 21 enters the slot 20, the sear 28 cannot disengag'e the lug 27, and, therev fore, even thoughthe trigger be pulled when the piece is cocked,yet, the cartridge will not be fired unless all .the parts are in their proper interlocked positions. It, therefore, follows, that after having once fired the piece it could not -be again fired without releasing the trigger even though the breech block and barrel are properly interlocked,

nor can the piece be fired after the trigger has been released unless the said breech block and barrel are properlyinterlocked. Consequentlyit is plain that the trigger mechanism above dlsclosed not only provides a long and easy pull but also eectually preally no matter what may be the condition of its parts; while at the same time it providesl for firingas fast as the trigger can be released and pulledwhether this be ,by hand or done automatically.

Those skilledinthe art, it is obvions, may vary the detailsl of construction and arrangement of parts without departing from the spirit of my invention and, there-4 fore, I do not wish to belimited to such features except as may be required by the claims. I

What I claim is: j

1. In a trigger mechanism-for firearms the combination of a barrel a breech block; a' firing means a sear 1 controlling said means a trigger controlling said sear; andlmeans rigid with said sear and under' the control from being tired unintention'- of the trigger for preventing the piece from preventing the piece from being fired after,

being cocked but before said block is locked to-said barrel, substantially as described.

3. In a trigger mechanism for fire arms the combination of a lever having a sear;,'a

lao

trigger; -connections between said trigger and Sear by which the latter may be turned on its pivot upon pulling the trigger; means by which saidv connections are rendered inoperative to move said sear after the piece is fired and before the trigger is released, and means carried by said lever adaptedl to contact with the breech block and prevent the piece from being fired before 'said block is locked in place, substantially as described.

4.. In a trigger mechanism for lfire arms, the combination of a vlever having asear; a pivoted dog carried by said lever; al trigger adapted to engage said dog and to move said sear and lever; and means by which upon firing the piece the engagement between said trigger and said dog is rendered inoperative tomove, said sear, substantially as described.

.5. Ina trigger mechanism for fire arms the combination of a lever provided with a pivot vand a slot and having a sear; a pivoted dog carried by said \lever;` a trigger adapted to engage said dog and to move said sear and lever; and means by which upon firing the piece the said sear and lever are moved longitudinally of said slot and .the

` engagement between said trigger and said dog is rendered inoperative to move said sear; substantially as described.

6. In a trigger mechanism for firearms, the combination of a lever having a sear;

a pivoted dog carried by said lever; aspring between said dog and lever; a trigger' adapted to engage saiddog and to move said sear and lever; a spring between said trigger and lever; and means by which upon lirl ing the piece the engagement between said trigger and said dog is rendered inoperative to move sa1d sear, substantially as descrlbed.

7. In a trigger mechanism for fire arms the combination of al barrel; a` recoiling breech bolt; a firingI pin carrying a lug; a slidingly pivoted lever adapted to be movedv by said bolt and carrying a- Sear adapted to engage said lug; atrigger connected to saidA lever; and a dog pivoted to said lever adapted to'be engaged by said trigger when the piece is fired ,-and. to be moved out of its 'ing Athe piece from being 9. Ina trigger mechanism for fire arms,

the combination of a trigger; a slidingly pivoted lever carrying a sear at one end and a safety point at the other; and means com# prisinga springcontrolled dog pivoted to said lever by which said sear and point are controlled by said trigger, described.

substantially as 10. In a trigger mechanism for fire arms,

'the combination of a breech block provided witha slot; a lever having a safety point adapted to enter said slot; a sear carried by said lever; and a trigger for controlling said 'Sear and point, substantially as described.

11. In a trigger mechanism for fire arms, the combination of a breech block provided with a slot; a slidingly pivoted lever having a safety point adapted to enter said slot; a

sear vcarried by saidl lever; a sprlng controlled dog carried by said lever adapted to contact with a trigger; and a trigger for 12. In a trigger mechanism for fire arms, the combination of a breech block adapted to be moved to the rear and provided with a slot; a pivoted lever adapted to be moved by said block in its rearward motion and having a safety point adapted to enter said slot; a sear; a trigger; and connections between said trlgger and said lever and scar,

substantially as described.

13. In a trigger mechanism for fire arms,

.controlling said Sear and point; substantially as described.

the combination of a breech block adapted to move to the rear upon firing; a s'ear adapted to be moved by said breech block; a trigger for controlling saidl sear, and means rigid with said sear for preventing the piece from being fired before the said block is locked in place, substantiallyl as described.

14. In a trigger mechanism for fire arms the combination .of a rearwardly moving breech block; a trigger; a sear; means pivotally connected with said sear for .preventfired `after being cocked and before the trigger is released; and additional means rigid with said sear for preventing the piece being fired before the breech block is in its firing position, substantially as described.. l

15. In a trigger mechanism for fire arms, the 'combination of a sear; a dog pivotally connected thereto and provided with the inclined surface 47 and notch 46; and a trigger controlling. saia seal' and provided with a projection 49 adapted to engage said surface and notch,'substantia1ly as described.

16. Ina trigger mechanism for fire arms,

' the combination of a'slidingly pivoted Sear;

dog provided with a ro 1er, an inclined surface and a notch pivotally connected to said Sear; `and al trigger yieldingly connected to said sear and provided with a projection adapted to successively engage said 10 roller, inclinedsurface, and notch on said dog, substantially as described.

In testimony whereof, I aiiix my signature, in presence of two Witnesses.

CHARLES H. A. F. L. ROSS. Witnesses:

H. D. JAMESON, RIPLEY WILSON. 

